The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 22, 2003
Filed:
Sep. 18, 2001
Applicant:
Inventors:
John William Aidan Millar, Wiltshire, GB;
Richard Hedley Clarke, Wiltshire, GB;
Assignee:
Groundflow Limited, Marlborough, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01V 1/36 ; G01V 1/40 ; G01V 1/20 ;
U.S. Cl.
CPC ...
G01V 1/36 ; G01V 1/40 ; G01V 1/20 ;
Abstract
A method and apparatus for measuring the properties, such as permeability, of the rock surrounding a metal cased borehole by generating a seismic or sonic shock downhole within the borehole which is propagated into the surrounding formation where it generates an electrokinetic signal which is detected by measuring the potential between at least two space apart electrodes in contact with the casing.